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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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 Posted: Thu Sep 14, 2006 11:14 am Post subject: Mic plug / PTT wiring |
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The example on Bob's web site shows that the PTT switch is wired to the
Ground/common on the Mic plug recepticle (in addition to the
key/terminal) is there any reason why the PTT switch (in my case on a
control stick/grip) can't be wired to a common ground for the control/
grip rather than to the mic plug common?
Deems Davis RV-10 # 406
Panel/wiring
http://deemsrv10.com/
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Bill Denton
Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA
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| Posted: Thu Sep 14, 2006 11:22 am Post subject: Mic plug / PTT wiring |
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A properly installed aircraft mic jack uses an insulating washer (or other
means) to ensure that the jack is NOT connected to a common ground...
--
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john(at)morgensen.com
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| Posted: Thu Sep 14, 2006 12:03 pm Post subject: Mic plug / PTT wiring |
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Hope I can contribute here. I encountered an FBO Cessna that was not
grounded properly. The symptoms were PTT produced a side-tone with old
cheap headsets but no side-tone with brand new ANR headsets.
John Morgensen RV-9A QB
Deems Davis wrote:
| Quote: |
The example on Bob's web site shows that the PTT switch is wired to the
Ground/common on the Mic plug recepticle (in addition to the
key/terminal) is there any reason why the PTT switch (in my case on a
control stick/grip) can't be wired to a common ground for the control/
grip rather than to the mic plug common?
Deems Davis RV-10 # 406
Panel/wiring
http://deemsrv10.com/
>
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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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| Posted: Thu Sep 14, 2006 12:47 pm Post subject: Mic plug / PTT wiring |
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I think I understand the need to isolate the mic plug with the
insulating washers. My question which remains is does the PTT switch
need to be wired directly to the common terminal (as depicted on the web
site example) on the mic plug? In my case this will be difficult as I
plan to use a switch on a control stick which already is wired with a
common ground. I'm 'assuming' that I can wire the control grip switch to
the mic plug 'key' terminal, and the common/ground will be through the
common/ground in the control grip wiring. (?)
Deems Davis RV10 # 406
Panel/wiring
http://deemsrv10.com/
John Morgensen wrote:
| Quote: |
<john(at)morgensen.com>
Hope I can contribute here. I encountered an FBO Cessna that was not
grounded properly. The symptoms were PTT produced a side-tone with old
cheap headsets but no side-tone with brand new ANR headsets.
John Morgensen RV-9A QB
Deems Davis wrote:
>
> <deemsdavis(at)cox.net>
>
> The example on Bob's web site shows that the PTT switch is wired to
> the Ground/common on the Mic plug recepticle (in addition to the
> key/terminal) is there any reason why the PTT switch (in my case on a
> control stick/grip) can't be wired to a common ground for the
> control/ grip rather than to the mic plug common?
>
> Deems Davis RV-10 # 406
> Panel/wiring
> http://deemsrv10.com/
>>
>
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Bill Denton
Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA
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| Posted: Thu Sep 14, 2006 1:01 pm Post subject: Mic plug / PTT wiring |
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What brand of control stick are you using?
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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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| Posted: Thu Sep 14, 2006 7:54 pm Post subject: Mic plug / PTT wiring |
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CH products
http://www.chproducts.com/retail/aircraft.html
Deems
Bill Denton wrote:
[quote]
What brand of control stick are you using?
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nuckollsr(at)cox.net
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| Posted: Sun Sep 17, 2006 11:42 am Post subject: Mic plug / PTT wiring |
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At 12:12 PM 9/14/2006 -0700, you wrote:
| Quote: |
The example on Bob's web site shows that the PTT switch is wired to the
Ground/common on the Mic plug recepticle (in addition to the key/terminal)
is there any reason why the PTT switch (in my case on a control
stick/grip) can't be wired to a common ground for the control/ grip rather
than to the mic plug common?
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The push-to-talk circuit is not a potential ingress
point for noise to a radio. It's probably a safe bet
to combine PTT ground with other grounds in the stick
grip.
Bob . . .
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